The American elm has a unique natural vase shape and a very nice yellow gold color.
It's an enormous tree, grows quickly and tolerates all kinds of difficulties from vehicle exhaust to poor soil.
Not many American elms (Ulmus americana) remain in the landscape. A fungus disease dubbed "Dutch Elm disease" swept the continent in the 1960's and 1970's, killing as many as a billion of these trees. The disease remains established in the environment so that it is unwise to plant any but disease-resistant varieties or American-Asian hybrids.
Its blooms are not generally recognized as such. Yet the tiny flowering structures are borne in dense masses, as are the seed pods, so that the whole plant may be an impressive yellow green in spring.